- Correspondence to Professor Jiaxiang Wang, Department of Pediatric Surgery, First Affiliated Hospital of Zhengzhou University, Construction East Road 1, Erqi District, Zhengzhou, Henan 450052, PR China;
- Received May 19, 2015
- Revised June 15, 2015
- Accepted June 30, 2015
- First published July 16, 2015.
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